What is the difference between 80 lb and 100 lb paper?

What is the difference between 100 lb Text and 100 lb Cover?

These are typical question we get asked all the time. If you look at any book you will notice that the cover is always thicker than the Block (The Block is the inside section of a book, the story) that is typically the 100 Lbs Text. Although they are both called 100 pound (# or Lbs) the difference is in the description Cover VS Text. Below is a table that shows the thickness of the paper based on it’s type.